56 lines
2.0 KiB
Markdown
56 lines
2.0 KiB
Markdown
# Midea AC Controller PCB Design
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Custom PCB design for controlling Midea/Inventor AC units using ESP32 with BLE beacon capabilities.
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## Project Files
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- `Midea_ESP.kicad_pro` - KiCad project file
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- `Midea_ESP.kicad_sch` - Schematic file
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- `Midea_ESP.kicad_pcb` - PCB layout file
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- `Midea_ESP.kicad_prl` - Project local settings
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## Custom Library
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- `libs/Midea_AC_Controller.kicad_sym` - Custom symbol library containing:
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- ESP32-WROOM-32E
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- TXB0104PWR (Level shifter)
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- AMS1117-3.3 (Voltage regulator)
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- CP2102N (USB-to-Serial - not used, kept for reference)
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## Documentation
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- **`SCHEMATIC_COMPONENT_LIST.md`** - Complete component list with pin-by-pin connections and schematic structure
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- **`QUICK_START_SCHEMATIC.md`** - Step-by-step guide for building the schematic in KiCad
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- **`PROGRAMMING_HEADER.md`** - Programming header pinout and connection guide
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- **`COMPONENT_SIZES.md`** - Recommended package sizes for all components (capacitors, resistors, LEDs, etc.)
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- **`AC_CONNECTION.md`** - AC connector pinout and connection guide
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## Getting Started
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1. Open the project in KiCad: `kicad Midea_ESP.kicad_pro`
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2. Follow `QUICK_START_SCHEMATIC.md` to build the schematic
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3. Refer to `SCHEMATIC_COMPONENT_LIST.md` for detailed component information
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4. Use `PROGRAMMING_HEADER.md` when connecting a USB-to-Serial adapter for flashing
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## Design Features
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- ESP32-WROOM-32E microcontroller
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- 5V to 3.3V voltage regulation (AMS1117-3.3)
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- 3.3V ↔ 5V level shifter (TXB0104PWR) for AC communication
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- Programming header for external USB-to-Serial adapter
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- Reset and boot buttons
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- Status LEDs
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- JST-XH connector (J1) - Provides power input and AC communication
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## Power Supply
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- **Power Input:** J1 Pin 1 (+5V) - Powers the entire PCB
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- **Voltage Regulator:** AMS1117-3.3 converts 5V to 3.3V for ESP32
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- **Ground:** J1 Pin 4 (GND)
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## Cost Optimization
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- Uses programming header instead of onboard USB-to-Serial chip (saves ~$2.50 per board)
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- Minimal component count while maintaining functionality
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